Overview of the drug (Modafinil)  Modafinil is an oral medication used to enhance wakefulness in those who suffer from excessive sleepiness. It is identical to armodafinil (Nuvigil). Like amphetamines, modafinil promotes sleeplessness by propelling the brain. The precise mechanism of action of modafinil is unspecified. It may function by boosting the percentage of dopamine (a chemical...